Quartz-mill



No. 748,867. PATENTED JAN. 5,1904. 0. J. HODGE.

QUARTZ MILL.

APPLICATION FILED MAY 13, 1901. N0 MODEL. 3 SEEBT8-8KEIIT 1.

I mil nu Iii-i No. 748,867. PATENTED JAN. 5, 1904. G. J. HODGE.

. QUARTZ MILL.

APPLIUATIOH FILED MAY 13. 1901.

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PATENT-ED JAN. 5, 1904. 0; J. HODGE.

' QUARTZ MILL. 7 APPLICATION FILED MAY 13, 1901.

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UNITED STATES Patented January 5, 1904.

PATENT OFFICE.

QUARTZ-MILL.

I SPECIFICATION forming part of Letters Patent No. 748,867, dated January 5, 1904.

Application filed May 13, 1901. Serial No. 59.945. (No model.)

To (1% whom it may concern:

Be it known that 1, CHARLES J. Hones, a citizen of the United States, residing'at Houghton, in the county of Houghton and State of Michigan, have invented certain new and useful Improvements in Quartz-Mills, of which the following is a full, clear, and exact specification.

My invention relates to mills for'grinding or pnlverizing quartz and other materials,and more particularly to that type of quartz-mills shown, described, and claimed in United States Letters Patent No. 317,359, issued to myself May 5, 1885, in which are employed two grinding-cones, between which the material or quartz is fed from a superposed hopper carried by one of them, and which cones have converging grinding-faces serving to pulverize the material as it works its way out from between their lower edges; and my invention has for one of its important objects to increase the grinding-surfaces of the cones without'increasing their diameter and at the same time reduce to the minimum the liability of the material escaping from between the grinding-surfaces before being pulverized to the desired degree of fineness, and also reducin g the liability of the material becoming gorged betweenthe converging faces.

With these ends in view my invention consists in certain features of novelty. in the con-- struction, combination, and arrangement of parts by which the said objects and certain other objects hereinafter appearing are attained, all as fully described with reference to the accompanying drawings, and more particularly pointed out in the claims.

In the said drawings, Figure l is a plan view of my improved quartz-mill. Fig. 2 is a vertical longitudinal sectional view thereof. Fig. 2 is a detail vertical section of the means whereby the stem is supported on the driving-shaft. Fig. 3 is a side elevation looking from the right in Fig. 2; and Fig. 4 is a detail vertical section of the trough and cover,taken on a line transverse of the driving-shaft.

l is a base-frame, which may be provided with any suitable support or pedestal, (not shown,) whereby the fly-wheels 2 3 are held apart. One of the fly-wheels 2 3 is arranged on each sideof the machine, as clearly shown in Figs. 1 and 2, and secured todriving-shaft one of which is an idler, while the other is fixed to the shaft and adapted to drive it by means of any suitable belting. (Not shown.)

By thus providing both sides of the machine with a fly-wheel and also driving from both sides it will be seen that undue vibration is prevented, and the strain of the belt on one side, tending to twist the machine, is avoided.

'8 represents the lower fixed one of the grinding-cones, which is supported on the base-frame lin any suitable manner, as by means of standards 9, and 10 is the upper revolving one of the cones. The fixed cone 8 is provided with a tubular elongated neck 11, in which is journaled the depending vertical hollow spindle or, journal 12 of the domeshaped upper member 12*, having a flange l2 fitting against the revolving cone 10, and passing downwardly through the journal 12 is a stem 13, on the lower end of which is threaded a nut 14, which serves as the support for the journal 12 and has means for varying the distance between the grindingfaces of the cones. The nut la is located in the hollowneck 11 and held against rotation thereinv by means of a pin 15 running in a vertical slot 16 in the side of the neck 11, so

that the nut 14 may be raised or lowered by turning the stem 13, and thus adjust the outer cone vertically with relation to the lower one.

The lower extremity of the stem 13 passes through the lower cone and isstepped in a yoke 17, so as to be capable of turning independently of said yoke, but is provided with a peripheral groove in which engages a pin 18, driven through the side of the yoke to prevent the stem 13 from lifting out of its step.

The yoke 17 straddles the driving-shaft 4, as

shown in Fig. 2*, and it also embraces a cam 19, as shown in Fig. 2, which cam engages an antifriction-roller 20, journaled between the bifurcations of the yoke 17 and carried thereby, so that at each revolution of the shaft 4 the-stem l3, and as a consequence the upper'cone supported thereon, will.be raised and lowered with referenee'to the lower cone,

thus permitting the quartz or other material fed into the space 21 between the cones from superposed hopper 22 or by other suitable means to find its way between the grindingfaces.

The grindingfaces of the cones in my present invention are constituted by hardened faces or plates 23 24 set into the contiguous faces of the cones, respectively, and the opposed faces of the plates 23 24 are parallel and fit accurately together. They also extend from the lower edges of the cones inwardly a considerable distance, when they abruptly diverge from each other to form a crevice or annular pocket 25, which gradually widens out in the ore bell-shaped space 21. The hardened plates 23 24 are in turn set into hardened faces or plates 26 27 in the cones, respectively, which conform to the gradually converging space 21 between the upper parts of the cones and the space between the inner edges of the plates 23 24. With the cones thus constructed it will be seen that the larger particles of material contained in the wider part of the space 21 will be gradually reduced in size as they work downwardly between the converging faces of the plates 26 27, and by the time they arrive into the slightly-inclined space 25 between the plates 23 24 they will be reduced sufficiently in size to be received between the slightly-inclined plates 23 24. As the latterare supported by the action of the cam 19 and the grindingfaces of the plates 23 24 being considerably extended transversely, the particles will be much longer subjected to the pulverizing acengaging with a gear-ring 32, secured to the upper cone in any suitable way.

The material as it issues from the grindingsurfaces of the cones is received in a trough 33, whose inner wall 34 is annular and pref erably concentric with the grinding-cones, while its outer walls preferably extend transversely of the shaft 4. The bottom of this trough 33 is substantially square or rectangular, as appears in plan view in Fig. 1, at least in outline, the center being cutout and slanted by the annular wall 34, as before described, and this bottom slants or inclines in both directions from one of the diametersthe one which extends longitudinally of the shaft 4, as clearly shown in Fig. 3so that the material falling thereon from the edges of the grinding-cones will work off in both directions and discharge through the discharge-lips The upper side of the trough is closed byacasing which has adownwa'rdlyextending portion 36 on each side secured to the outer walls of the trough by bolts or rivets 37 and flanges 38, and formed on or secured to the cover 36 is an annular casing 39, which, as better shown in Fig. 2, surrounds and partially overhangs the gearing 32, thus completely covering the trough 33 and inclos.

ing the discharge edges of the grinding-cones, the annular casing 39 being provided on one side with an aperture 40, whereby the pinion 31 may engage with the teeth of the ring 32.

Having thus described my invention, what I.claim as now therein, and desire to secure by Letters Patent, is

A quartz-mill comprising a lower fixed cone having an upwardly-extending elongated tubular neck, a driving-shaft, a stem passed through the tubular neck and supported on the driving-shaft, an upper revolving cone, having agear-ring, a dome-shaped upper member fitting within the revolving cone and having a depending hollow spindle supported on the stem within the tubular neck, the inner and outer plates secured to the fixed and revolving cones respectively, and providing a bell-shaped space between them, the hardened plates set into the inner and outer plates and formed with an annular pocket between them, the lower and upper casings within which the cones are located, the lower casing consisting of a rectangular bottom, outer walls and inner wall providing a trough between them,'having side lips, inclined in opposite directions, the upper casing consisting of side walls detachably secured to the lower casing and a cover, and means for driving the revolving cone having a gear-wheel meshing with the gear-riug through an opening in the upper casing.

CHARLES J. HODGE.

Witnesses:

EDNA B. JOHNSON, F. A. HOPKINS. 

